131288209 has 16 divisors (see below), whose sum is σ = 148305024. Its totient is φ = 115315200.

The previous prime is 131288207. The next prime is 131288231. The reversal of 131288209 is 902882131.

It is not a de Polignac number, because 131288209 - 2¹ = 131288207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131288207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62049 + ... + 64129.

It is an arithmetic number, because the mean of its divisors is an integer number (9269064).

Almost surely, 2^131288209 is an apocalyptic number.

It is an amenable number.

131288209 is a deficient number, since it is larger than the sum of its proper divisors (17016815).

131288209 is a wasteful number, since it uses less digits than its factorization.

131288209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 131288209 is about 11458.1066935162. The cubic root of 131288209 is about 508.2474885286.

The spelling of 131288209 in words is "one hundred thirty-one million, two hundred eighty-eight thousand, two hundred nine".